throttle body size

[danielmk323]

Hi guys maybe some one will help me my car is running 210 whp now im looking to go efi and i m get erring all it is need it my problem is i don't now what throttle body size should i use i don t want to go to small or to big

[Andrew Cooke]

As a starting point, 100hp per square inch. But also look at what boost pipes you'd use, and what fits.

you have about 240 crank, so ~45-50mm is a good starting point, certainly not less than 45mm, but don't worry about the size too much, more the fitment.

[BluntyR5GTT]

would an mgzr throttle bodie be any good they come in either 48 or 52mm (52mm are only fount on the vvc engined cars)

[danielmk323]

Tanks for the help

[Os8472]

Mk 4 Ford fiesta zetec, it's a 45mm throttle body, should do the job nicely